Introduction:
In welding, there are various accessories that are used to ensure safety, efficiency, and effectiveness in the welding process. These accessories play a crucial role in protecting the welder and ensuring the quality of the weld. However, one of the options mentioned is not a welding accessory. Let's discuss each option and identify the one that is not a welding accessory.

Options:
a) Electrode holder: An electrode holder is a device used to hold the welding electrode securely in place during the welding process. It provides a safe grip on the electrode and allows the welder to control its position. The electrode holder is an essential accessory for shielded metal arc welding (SMAW) or stick welding.

b) Hand screen: A hand screen, also known as a welding screen, is a protective device used to shield the welder's hand from sparks, spatter, and harmful ultraviolet (UV) and infrared (IR) radiation during the welding process. It is typically made of a fire-resistant material and is an important accessory for hand protection in welding.

c) Cooling fan: A cooling fan is not a welding accessory. It is a device used to cool down the welding machine or the surrounding area. Welding machines generate heat during operation, and a cooling fan helps dissipate this heat, preventing the machine from overheating. While a cooling fan may be present in a welding setup, it is not directly used as an accessory in the welding process itself.

d) Gloves: Welding gloves are an essential accessory for hand protection in welding. They are designed to withstand high temperatures, sparks, and spatter. Welding gloves provide a barrier between the welder's hands and the welding process, protecting them from burns and other injuries.

Conclusion:
Based on the discussion above, it is evident that the option 'c) Cooling fan' is not a welding accessory. While cooling fans may be used in welding setups, they are not directly involved in the welding process itself and do not contribute to the safety or quality of the weld. The other options, such as electrode holder, hand screen, and gloves, are all important welding accessories that play a significant role in ensuring the welder's safety and the quality of the weld.